Window part
Hello,
In order to identify your balance, we'll need a picture of both end attachments and the length of the metal channel. Take a look at our channel balance guide that may be able to walk you through which one to choose.
If you're still unsure, send us some more photos and we'll do our best to point you in the right direction.
It looks like you have the S385-32, which has a 1-3/32" shoe. If that measurement and your 32" channel length is correct, you should be good to go with this balance.
Not from the pictures, no, but the stamp gives a hint. "3160" is close to your "31 6." You can weigh your window sash to verify that. The S385-32 webpage lists which options hold which weights.